Wrong fully selling

Hi I have been buying from auction nation for a will and had no problems in the past but after finding it difficult to attend the auction they suggested that I try there online auction I tried it and bought two in one day one from Johannesburg and one from Duran I already from viewing the vehicle in Johannesburg picked up a problem not knowing what's coming from Duran. I got a call that the car has arrived and ready to collect so when I bought the car it status was it starts and on my inspection in noticed the sump is broken and it's been moved around and by now there must be sand and even pieces of the sump that might have gone into the engine so I was referred to Gift I was told they can start is but if it starts I must take it I explained to him there is no way in any circumstances that I will take that risk because that will cause long term damage he told me then you losing R6000+tow+profit I explained to him I'm along time customer he told me we have this every week people buy online and find problems and we take there money you can be replaced by thousands of others. So in short I'm not willing to take the risk to start yet they cannot proof the car runs